Brake.



E. BARGER.

BRAKE.

APPLICATION FILED MAY 28, 1914.

Patented Aug. 14, 1917.

2 $HEETSSHEET 1- nventor Attorneys E. BARGER.

BRAKE.

APPLICATION FILED MAY 28 1914.

1,936,392. Patented Aug. 14, 1917.

Z SHEETS-SHEET 2.

Witn'esses Attprneys EZRA. BARGER, 0F GREENEVILLE, TENNESSEE.

BRAKE.

Specification of Letters Patent.

Patented Aug. 14, 1917.

Application filed May 28, 1914. Serial No. 841,575.

To all whom it may concern.

Be it known that I, EZRA BAnenn, a citizen of the United States, residing at Greeneville, in the county of Greene and State of Tennessee, have invented a new and useful Brake, of which the following is a specification.

The present invention relates to improvements in automatic cable drums, the same being especially adapted for use in connection with steam shovels or other forms of derricks, in which a swinging boom is used, one object of the invention, being the pro vision of automatically actuated means for holding-taut the paying out cable during the time that the opposite cable is a winding cable, and vice versa.

A further object of the present invention is the provision of a novel construction of resiliently mounted brake band for use in connection with the brake drums of automatic cable drums, whereby the wear upon the band and the drum will be readily taken care of to thus insure the proper friction action between the two to insure the proper tautness in the two cables when either one is the slack and the other is being wound.

With the foregoing and other objects in view which will appear as the description proceeds, the invention resides in the combination and arrangement of parts and in the details of construction hereinafter described and claimed, it being understood that changes in the precise embodiment of the invention herein disclosed can be made within the scope of what is claimed without departing from the spirit of the invention.

In the drawings v Figure 1 is a top plan view of the cable drum portion of a steam shovel 0r hoisting apparatus, showing the present invention in use.

Fig. 2 is a section taken on line 2-2 of Fig. 1, distant parts being omitted.

Fig. 3 is an enlarged detail sectional view of the brake band. 1

Referring to the drawings, the numeral 1 designates the base, which has mounted thereupon the main shaft 2 carrying the operating gear 3 which may be operated with any form of prime mover (not shown). Mounted upon this shaft for free rotation are the two drums 4c and 5, each one of which is adapted to be connected alternately to be rotated by the shaft through the nib-itch controlled mechanism the con-' struction of each of the respective brake mechanisms 7 and 8 is identical, the constrpction of one only will be set forth in detai Attached to the respective transverse beams 9 and 10 of the frame or base 1, and as particularly illustrated in Fig. 2, are the metal fastenings 11 and 12. The fastening or plate 11, is provided with the hooked terminal 13 for the reception of the bail or metal link 14 carried by the terminal 15 of the brake band 16. This brake band as clearly illustrated in Fig. 3, is composed of the metal member 17 which is provided with rivets 18 for connecting thereto, the leather brake drum engaging portion 19.

Connected to the brake band 16 at the other terminal, is a connecting plate 20 which has connected thereto by means of a link 50 the spring 21, whose other terminal is connected to the upstanding member of the plate 12. This spring 21 is so adjusted as to normally hold the brake band in braking relation to the drum 7 or 8, thus taking care of any wear upon the drum engaging portion 19 of the band or the periphery of the drum.

By this means of construction, the brake band is resiliently held in contact with the drum so that the desired tautness or braking action is had upon the respective drums as the cable is paid therefrom and is drawn or wound upon the opposite drum.

The advantage of this construction is readily apparent in excavating machines and derricks where the back lash upon the loose cable will cause a jerky motion to be imparted to the boom, this peculiar form of resiliently held brake band maintaining the paying out cable taut, so that no back lash is permitted and the boom is permitted the gradual movement due to the pulling thereupon by the cable wound upon the respective drums.

The brake bands operate automatically to insure the proper tautness of the paying out cable so that all the operator has to attend to is the shifting of the clutches and the consequent winding action imparted to the winding cable.

What is claimed is:

In a device of the class described, a support including spaced bars; a drum journaled on the support; a brake band extended part way around the drum; a vertiealhook upstanding from one bar and disposed, tam

gentially to the drum; a link on one end of the brake band and detachably interengaged with the hook; a spring attached to the other bar and inclined outwardly with respect to the vertical; a link connected with the upper end of the spring; and a plate wherewith the last specified link is connected, the plate being secured directly to the outer face of the band at the other end 10 of the band and constituting a means for spacing the link and the spring from the periphery of the drum.

In testimony that I claim the foregoing as my own I have hereto afiiXed my signature in the presence of two witnesses.

EZRA BARGER.

Witnesses:

W. W. HARMON, G. E. MILLER.

Copies of this patent may be obtained for five cents each, by addressing the Commissioner of Patents,

Washington, D. G. Y 

